diff --git a/includes/common.inc b/includes/common.inc
index c260f7a..e42062a 100644
--- a/includes/common.inc
+++ b/includes/common.inc
@@ -1078,7 +1078,7 @@ function drupal_http_request($url, array $options = array()) {
         // If the location is a relative path, we need to add it to the existing
         // scheme and host.
         $location_uri = @parse_url($location);
-        if (empty($location_uri['scheme'])) {
+        if ($location_uri !== FALSE && empty($location_uri['scheme'])) {
           $location = $uri['scheme'] . '://' .  $uri['host'] . $location;
         }